| 摘要 |
<p>The prefabricated reinforced concrete tunnel sections are used in district heating systems. Several tubes are arranged side by side and placed on supports on the tunnel base. A tunnel cover is placed over the tubes. The tunnel cover (53) with the exception of the cover plate (16) forms an integral transportable unit (13) together with tunnel base (10). This tunnel section carries tubes (17, 18). The unit has, on its upper side, longitudinal supports (14, 15) for covers (16) forming part of the structure. These covers are separate units and they can be arranged in sections.</p> |
